Vaadin 8 library jar manifests and ensuing $CLASSPATH issues

Hello,
I am now using Vaadin 8.1.0 and I notice that while copiling on cmd line I see warnings such as

warning: [path]
bad path element “/home/soler/local/java/vaadin8.1.0/lib/yuicompressor-2.4.8.jar”: no such file or directory
warning: [path]
bad path element “/home/soler/local/java/vaadin8.1.0/lib/js-1.7R2.jar”: no such file or directory
warning: [path]
bad path element “/home/soler/local/java/vaadin8.1.0/lib/xml-apis.jar”: no such file or directory
warning: [path]
bad path element “/home/soler/local/java/vaadin8.1.0/lib/xercesImpl.jar”: no such file or directory
warning: [path]
bad path element “/home/soler/local/java/vaadin8.1.0/lib/serializer.jar”: no such file or directory

I am wondering if the MANIFEST.MF files that correpond to one or more of the vaadin-*.jar files that come bundled with the vaadin 8.1 distribution have references to other jars (as noted above) that are either obsolete or no longer included with the distribution. Maybe the manifest files need to be cleaned up?

Thanks,
-George